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Commit | Line | Data |
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1da177e4 | 1 | /* |
4a3f6b5b | 2 | * ec.c - ACPI Embedded Controller Driver (v2.2) |
1da177e4 | 3 | * |
4a3f6b5b LZ |
4 | * Copyright (C) 2001-2014 Intel Corporation |
5 | * Author: 2014 Lv Zheng <lv.zheng@intel.com> | |
6 | * 2006, 2007 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> | |
7 | * 2006 Denis Sadykov <denis.m.sadykov@intel.com> | |
8 | * 2004 Luming Yu <luming.yu@intel.com> | |
9 | * 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
10 | * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
11 | * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> | |
1da177e4 LT |
12 | * |
13 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or (at | |
18 | * your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, but | |
21 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
23 | * General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License along | |
26 | * with this program; if not, write to the Free Software Foundation, Inc., | |
27 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. | |
28 | * | |
29 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
30 | */ | |
31 | ||
7c6db4e0 | 32 | /* Uncomment next line to get verbose printout */ |
d772b3b3 | 33 | /* #define DEBUG */ |
16a26e85 | 34 | #define pr_fmt(fmt) "ACPI : EC: " fmt |
d772b3b3 | 35 | |
1da177e4 LT |
36 | #include <linux/kernel.h> |
37 | #include <linux/module.h> | |
38 | #include <linux/init.h> | |
39 | #include <linux/types.h> | |
40 | #include <linux/delay.h> | |
451566f4 | 41 | #include <linux/interrupt.h> |
837012ed | 42 | #include <linux/list.h> |
7c6db4e0 | 43 | #include <linux/spinlock.h> |
5a0e3ad6 | 44 | #include <linux/slab.h> |
8b48463f | 45 | #include <linux/acpi.h> |
eb27cae8 | 46 | #include <linux/dmi.h> |
8b48463f | 47 | #include <asm/io.h> |
1da177e4 | 48 | |
1195a098 TR |
49 | #include "internal.h" |
50 | ||
1da177e4 | 51 | #define ACPI_EC_CLASS "embedded_controller" |
1da177e4 LT |
52 | #define ACPI_EC_DEVICE_NAME "Embedded Controller" |
53 | #define ACPI_EC_FILE_INFO "info" | |
837012ed | 54 | |
703959d4 | 55 | /* EC status register */ |
1da177e4 LT |
56 | #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ |
57 | #define ACPI_EC_FLAG_IBF 0x02 /* Input buffer full */ | |
dd43de20 | 58 | #define ACPI_EC_FLAG_CMD 0x08 /* Input buffer contains a command */ |
451566f4 | 59 | #define ACPI_EC_FLAG_BURST 0x10 /* burst mode */ |
1da177e4 | 60 | #define ACPI_EC_FLAG_SCI 0x20 /* EC-SCI occurred */ |
4350933a | 61 | |
703959d4 | 62 | /* EC commands */ |
3261ff4d | 63 | enum ec_command { |
6ccedb10 AS |
64 | ACPI_EC_COMMAND_READ = 0x80, |
65 | ACPI_EC_COMMAND_WRITE = 0x81, | |
66 | ACPI_EC_BURST_ENABLE = 0x82, | |
67 | ACPI_EC_BURST_DISABLE = 0x83, | |
68 | ACPI_EC_COMMAND_QUERY = 0x84, | |
3261ff4d | 69 | }; |
837012ed | 70 | |
5c406412 | 71 | #define ACPI_EC_DELAY 500 /* Wait 500ms max. during EC ops */ |
703959d4 | 72 | #define ACPI_EC_UDELAY_GLK 1000 /* Wait 1ms max. to get global lock */ |
2a84cb98 | 73 | #define ACPI_EC_MSI_UDELAY 550 /* Wait 550us for MSI EC */ |
ad332c8a KC |
74 | #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to query |
75 | * when trying to clear the EC */ | |
703959d4 | 76 | |
080e412c | 77 | enum { |
080e412c | 78 | EC_FLAGS_QUERY_PENDING, /* Query is pending */ |
7c6db4e0 | 79 | EC_FLAGS_GPE_STORM, /* GPE storm detected */ |
f6bb13aa | 80 | EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and |
7c6db4e0 | 81 | * OpReg are installed */ |
fe955682 | 82 | EC_FLAGS_BLOCKED, /* Transactions are blocked */ |
1da177e4 | 83 | }; |
6ffb221a | 84 | |
f92fca00 LZ |
85 | #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ |
86 | #define ACPI_EC_COMMAND_COMPLETE 0x02 /* Completed last byte */ | |
87 | ||
7a18e96d TR |
88 | /* ec.c is compiled in acpi namespace so this shows up as acpi.ec_delay param */ |
89 | static unsigned int ec_delay __read_mostly = ACPI_EC_DELAY; | |
90 | module_param(ec_delay, uint, 0644); | |
91 | MODULE_PARM_DESC(ec_delay, "Timeout(ms) waited until an EC command completes"); | |
92 | ||
a520d52e FT |
93 | /* |
94 | * If the number of false interrupts per one transaction exceeds | |
95 | * this threshold, will think there is a GPE storm happened and | |
96 | * will disable the GPE for normal transaction. | |
97 | */ | |
98 | static unsigned int ec_storm_threshold __read_mostly = 8; | |
99 | module_param(ec_storm_threshold, uint, 0644); | |
100 | MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); | |
101 | ||
837012ed AS |
102 | struct acpi_ec_query_handler { |
103 | struct list_head node; | |
104 | acpi_ec_query_func func; | |
105 | acpi_handle handle; | |
106 | void *data; | |
107 | u8 query_bit; | |
108 | }; | |
109 | ||
8463200a | 110 | struct transaction { |
7c6db4e0 AS |
111 | const u8 *wdata; |
112 | u8 *rdata; | |
113 | unsigned short irq_count; | |
8463200a | 114 | u8 command; |
a2f93aea AS |
115 | u8 wi; |
116 | u8 ri; | |
7c6db4e0 AS |
117 | u8 wlen; |
118 | u8 rlen; | |
f92fca00 | 119 | u8 flags; |
7c6db4e0 AS |
120 | }; |
121 | ||
1195a098 TR |
122 | struct acpi_ec *boot_ec, *first_ec; |
123 | EXPORT_SYMBOL(first_ec); | |
703959d4 | 124 | |
5423a0cb | 125 | static int EC_FLAGS_MSI; /* Out-of-spec MSI controller */ |
0adf3c74 | 126 | static int EC_FLAGS_VALIDATE_ECDT; /* ASUStec ECDTs need to be validated */ |
478fa03b | 127 | static int EC_FLAGS_SKIP_DSDT_SCAN; /* Not all BIOS survive early DSDT scan */ |
ad332c8a | 128 | static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ |
5423a0cb | 129 | |
1da177e4 LT |
130 | /* -------------------------------------------------------------------------- |
131 | Transaction Management | |
132 | -------------------------------------------------------------------------- */ | |
133 | ||
6ffb221a | 134 | static inline u8 acpi_ec_read_status(struct acpi_ec *ec) |
1da177e4 | 135 | { |
3ebe08a7 | 136 | u8 x = inb(ec->command_addr); |
dd43de20 LZ |
137 | pr_debug("EC_SC(R) = 0x%2.2x " |
138 | "SCI_EVT=%d BURST=%d CMD=%d IBF=%d OBF=%d\n", | |
139 | x, | |
140 | !!(x & ACPI_EC_FLAG_SCI), | |
141 | !!(x & ACPI_EC_FLAG_BURST), | |
142 | !!(x & ACPI_EC_FLAG_CMD), | |
143 | !!(x & ACPI_EC_FLAG_IBF), | |
144 | !!(x & ACPI_EC_FLAG_OBF)); | |
3ebe08a7 | 145 | return x; |
451566f4 DT |
146 | } |
147 | ||
6ffb221a | 148 | static inline u8 acpi_ec_read_data(struct acpi_ec *ec) |
703959d4 | 149 | { |
3ebe08a7 | 150 | u8 x = inb(ec->data_addr); |
dd43de20 | 151 | pr_debug("EC_DATA(R) = 0x%2.2x\n", x); |
7c6db4e0 | 152 | return x; |
7c6db5e5 DS |
153 | } |
154 | ||
6ffb221a | 155 | static inline void acpi_ec_write_cmd(struct acpi_ec *ec, u8 command) |
45bea155 | 156 | { |
dd43de20 | 157 | pr_debug("EC_SC(W) = 0x%2.2x\n", command); |
6ffb221a | 158 | outb(command, ec->command_addr); |
45bea155 LY |
159 | } |
160 | ||
6ffb221a | 161 | static inline void acpi_ec_write_data(struct acpi_ec *ec, u8 data) |
45bea155 | 162 | { |
dd43de20 | 163 | pr_debug("EC_DATA(W) = 0x%2.2x\n", data); |
6ffb221a | 164 | outb(data, ec->data_addr); |
703959d4 | 165 | } |
45bea155 | 166 | |
f92fca00 | 167 | static int ec_transaction_completed(struct acpi_ec *ec) |
6ffb221a | 168 | { |
7c6db4e0 AS |
169 | unsigned long flags; |
170 | int ret = 0; | |
f351d027 | 171 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 172 | if (ec->curr && (ec->curr->flags & ACPI_EC_COMMAND_COMPLETE)) |
7c6db4e0 | 173 | ret = 1; |
f351d027 | 174 | spin_unlock_irqrestore(&ec->lock, flags); |
7c6db4e0 | 175 | return ret; |
45bea155 | 176 | } |
451566f4 | 177 | |
c0d65341 | 178 | static bool advance_transaction(struct acpi_ec *ec) |
7c6db5e5 | 179 | { |
36b15875 | 180 | struct transaction *t; |
66b42b78 | 181 | u8 status; |
c0d65341 | 182 | bool wakeup = false; |
b76b51ba | 183 | |
66b42b78 LZ |
184 | pr_debug("===== %s =====\n", in_interrupt() ? "IRQ" : "TASK"); |
185 | status = acpi_ec_read_status(ec); | |
36b15875 | 186 | t = ec->curr; |
b76b51ba | 187 | if (!t) |
f92fca00 LZ |
188 | goto err; |
189 | if (t->flags & ACPI_EC_COMMAND_POLL) { | |
190 | if (t->wlen > t->wi) { | |
191 | if ((status & ACPI_EC_FLAG_IBF) == 0) | |
192 | acpi_ec_write_data(ec, t->wdata[t->wi++]); | |
193 | else | |
194 | goto err; | |
195 | } else if (t->rlen > t->ri) { | |
196 | if ((status & ACPI_EC_FLAG_OBF) == 1) { | |
197 | t->rdata[t->ri++] = acpi_ec_read_data(ec); | |
c0d65341 | 198 | if (t->rlen == t->ri) { |
f92fca00 | 199 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
200 | wakeup = true; |
201 | } | |
f92fca00 LZ |
202 | } else |
203 | goto err; | |
204 | } else if (t->wlen == t->wi && | |
c0d65341 | 205 | (status & ACPI_EC_FLAG_IBF) == 0) { |
f92fca00 | 206 | t->flags |= ACPI_EC_COMMAND_COMPLETE; |
c0d65341 LZ |
207 | wakeup = true; |
208 | } | |
209 | return wakeup; | |
f92fca00 LZ |
210 | } else { |
211 | if ((status & ACPI_EC_FLAG_IBF) == 0) { | |
212 | acpi_ec_write_cmd(ec, t->command); | |
213 | t->flags |= ACPI_EC_COMMAND_POLL; | |
7c6db4e0 | 214 | } else |
dd15f8c4 | 215 | goto err; |
c0d65341 | 216 | return wakeup; |
f92fca00 | 217 | } |
dd15f8c4 | 218 | err: |
a3cd8d27 FT |
219 | /* |
220 | * If SCI bit is set, then don't think it's a false IRQ | |
221 | * otherwise will take a not handled IRQ as a false one. | |
222 | */ | |
f92fca00 LZ |
223 | if (!(status & ACPI_EC_FLAG_SCI)) { |
224 | if (in_interrupt() && t) | |
225 | ++t->irq_count; | |
226 | } | |
c0d65341 | 227 | return wakeup; |
f92fca00 | 228 | } |
a3cd8d27 | 229 | |
f92fca00 LZ |
230 | static void start_transaction(struct acpi_ec *ec) |
231 | { | |
232 | ec->curr->irq_count = ec->curr->wi = ec->curr->ri = 0; | |
233 | ec->curr->flags = 0; | |
c0d65341 | 234 | (void)advance_transaction(ec); |
845625cd | 235 | } |
03d1d99c | 236 | |
3eba563e | 237 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data); |
7c6db4e0 | 238 | |
a62e8f19 | 239 | static int ec_check_sci_sync(struct acpi_ec *ec, u8 state) |
7c6db5e5 | 240 | { |
7c6db4e0 AS |
241 | if (state & ACPI_EC_FLAG_SCI) { |
242 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) | |
3eba563e | 243 | return acpi_ec_sync_query(ec, NULL); |
7c6db4e0 AS |
244 | } |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int ec_poll(struct acpi_ec *ec) | |
249 | { | |
2a84cb98 | 250 | unsigned long flags; |
28fe5c82 | 251 | int repeat = 5; /* number of command restarts */ |
2a84cb98 AS |
252 | while (repeat--) { |
253 | unsigned long delay = jiffies + | |
7a18e96d | 254 | msecs_to_jiffies(ec_delay); |
2a84cb98 AS |
255 | do { |
256 | /* don't sleep with disabled interrupts */ | |
257 | if (EC_FLAGS_MSI || irqs_disabled()) { | |
258 | udelay(ACPI_EC_MSI_UDELAY); | |
f92fca00 | 259 | if (ec_transaction_completed(ec)) |
2a84cb98 AS |
260 | return 0; |
261 | } else { | |
262 | if (wait_event_timeout(ec->wait, | |
f92fca00 | 263 | ec_transaction_completed(ec), |
2a84cb98 AS |
264 | msecs_to_jiffies(1))) |
265 | return 0; | |
266 | } | |
f92fca00 | 267 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 268 | (void)advance_transaction(ec); |
f92fca00 | 269 | spin_unlock_irqrestore(&ec->lock, flags); |
2a84cb98 | 270 | } while (time_before(jiffies, delay)); |
16a26e85 | 271 | pr_debug("controller reset, restart transaction\n"); |
f351d027 | 272 | spin_lock_irqsave(&ec->lock, flags); |
2a84cb98 | 273 | start_transaction(ec); |
f351d027 | 274 | spin_unlock_irqrestore(&ec->lock, flags); |
af3fd140 | 275 | } |
b77d81b2 | 276 | return -ETIME; |
1da177e4 LT |
277 | } |
278 | ||
8463200a | 279 | static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, |
2a84cb98 | 280 | struct transaction *t) |
45bea155 | 281 | { |
7c6db4e0 | 282 | unsigned long tmp; |
7c6db4e0 | 283 | int ret = 0; |
5423a0cb | 284 | if (EC_FLAGS_MSI) |
2a84cb98 | 285 | udelay(ACPI_EC_MSI_UDELAY); |
7c6db4e0 | 286 | /* start transaction */ |
f351d027 | 287 | spin_lock_irqsave(&ec->lock, tmp); |
7c6db4e0 | 288 | /* following two actions should be kept atomic */ |
8463200a | 289 | ec->curr = t; |
a2f93aea | 290 | start_transaction(ec); |
8463200a | 291 | if (ec->curr->command == ACPI_EC_COMMAND_QUERY) |
080e412c | 292 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); |
f351d027 | 293 | spin_unlock_irqrestore(&ec->lock, tmp); |
2a84cb98 | 294 | ret = ec_poll(ec); |
f351d027 | 295 | spin_lock_irqsave(&ec->lock, tmp); |
8463200a | 296 | ec->curr = NULL; |
f351d027 | 297 | spin_unlock_irqrestore(&ec->lock, tmp); |
7c6db4e0 AS |
298 | return ret; |
299 | } | |
300 | ||
2a84cb98 | 301 | static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) |
1da177e4 | 302 | { |
d7a76e4c | 303 | int status; |
50526df6 | 304 | u32 glk; |
8463200a | 305 | if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) |
d550d98d | 306 | return -EINVAL; |
8463200a AS |
307 | if (t->rdata) |
308 | memset(t->rdata, 0, t->rlen); | |
f351d027 | 309 | mutex_lock(&ec->mutex); |
fe955682 | 310 | if (test_bit(EC_FLAGS_BLOCKED, &ec->flags)) { |
f6bb13aa RW |
311 | status = -EINVAL; |
312 | goto unlock; | |
313 | } | |
703959d4 | 314 | if (ec->global_lock) { |
1da177e4 | 315 | status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); |
c24e912b | 316 | if (ACPI_FAILURE(status)) { |
7c6db4e0 AS |
317 | status = -ENODEV; |
318 | goto unlock; | |
c24e912b | 319 | } |
1da177e4 | 320 | } |
16a26e85 | 321 | pr_debug("transaction start (cmd=0x%02x, addr=0x%02x)\n", |
b76b51ba | 322 | t->command, t->wdata ? t->wdata[0] : 0); |
a62e8f19 AS |
323 | /* disable GPE during transaction if storm is detected */ |
324 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
3784730b RW |
325 | /* It has to be disabled, so that it doesn't trigger. */ |
326 | acpi_disable_gpe(NULL, ec->gpe); | |
a62e8f19 AS |
327 | } |
328 | ||
2a84cb98 | 329 | status = acpi_ec_transaction_unlocked(ec, t); |
a62e8f19 AS |
330 | |
331 | /* check if we received SCI during transaction */ | |
332 | ec_check_sci_sync(ec, acpi_ec_read_status(ec)); | |
333 | if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { | |
54070101 | 334 | msleep(1); |
3784730b RW |
335 | /* It is safe to enable the GPE outside of the transaction. */ |
336 | acpi_enable_gpe(NULL, ec->gpe); | |
a520d52e | 337 | } else if (t->irq_count > ec_storm_threshold) { |
16a26e85 | 338 | pr_info("GPE storm detected(%d GPEs), " |
b76b51ba FT |
339 | "transactions will use polling mode\n", |
340 | t->irq_count); | |
a62e8f19 AS |
341 | set_bit(EC_FLAGS_GPE_STORM, &ec->flags); |
342 | } | |
16a26e85 | 343 | pr_debug("transaction end\n"); |
703959d4 | 344 | if (ec->global_lock) |
1da177e4 | 345 | acpi_release_global_lock(glk); |
7c6db4e0 | 346 | unlock: |
f351d027 | 347 | mutex_unlock(&ec->mutex); |
d550d98d | 348 | return status; |
1da177e4 LT |
349 | } |
350 | ||
8a383ef0 | 351 | static int acpi_ec_burst_enable(struct acpi_ec *ec) |
c45aac43 AS |
352 | { |
353 | u8 d; | |
8463200a AS |
354 | struct transaction t = {.command = ACPI_EC_BURST_ENABLE, |
355 | .wdata = NULL, .rdata = &d, | |
356 | .wlen = 0, .rlen = 1}; | |
357 | ||
2a84cb98 | 358 | return acpi_ec_transaction(ec, &t); |
c45aac43 AS |
359 | } |
360 | ||
8a383ef0 | 361 | static int acpi_ec_burst_disable(struct acpi_ec *ec) |
c45aac43 | 362 | { |
8463200a AS |
363 | struct transaction t = {.command = ACPI_EC_BURST_DISABLE, |
364 | .wdata = NULL, .rdata = NULL, | |
365 | .wlen = 0, .rlen = 0}; | |
366 | ||
7c6db4e0 | 367 | return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? |
2a84cb98 | 368 | acpi_ec_transaction(ec, &t) : 0; |
c45aac43 AS |
369 | } |
370 | ||
6ccedb10 | 371 | static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 * data) |
3576cf61 DS |
372 | { |
373 | int result; | |
374 | u8 d; | |
8463200a AS |
375 | struct transaction t = {.command = ACPI_EC_COMMAND_READ, |
376 | .wdata = &address, .rdata = &d, | |
377 | .wlen = 1, .rlen = 1}; | |
3576cf61 | 378 | |
2a84cb98 | 379 | result = acpi_ec_transaction(ec, &t); |
3576cf61 DS |
380 | *data = d; |
381 | return result; | |
382 | } | |
6ffb221a | 383 | |
3576cf61 DS |
384 | static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) |
385 | { | |
6ccedb10 | 386 | u8 wdata[2] = { address, data }; |
8463200a AS |
387 | struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, |
388 | .wdata = wdata, .rdata = NULL, | |
389 | .wlen = 2, .rlen = 0}; | |
390 | ||
2a84cb98 | 391 | return acpi_ec_transaction(ec, &t); |
3576cf61 DS |
392 | } |
393 | ||
b76b51ba | 394 | int ec_read(u8 addr, u8 *val) |
1da177e4 | 395 | { |
1da177e4 | 396 | int err; |
6ffb221a | 397 | u8 temp_data; |
1da177e4 LT |
398 | |
399 | if (!first_ec) | |
400 | return -ENODEV; | |
401 | ||
d033879c | 402 | err = acpi_ec_read(first_ec, addr, &temp_data); |
1da177e4 LT |
403 | |
404 | if (!err) { | |
405 | *val = temp_data; | |
406 | return 0; | |
50526df6 | 407 | } else |
1da177e4 LT |
408 | return err; |
409 | } | |
50526df6 | 410 | |
1da177e4 LT |
411 | EXPORT_SYMBOL(ec_read); |
412 | ||
50526df6 | 413 | int ec_write(u8 addr, u8 val) |
1da177e4 | 414 | { |
1da177e4 LT |
415 | int err; |
416 | ||
417 | if (!first_ec) | |
418 | return -ENODEV; | |
419 | ||
d033879c | 420 | err = acpi_ec_write(first_ec, addr, val); |
1da177e4 LT |
421 | |
422 | return err; | |
423 | } | |
50526df6 | 424 | |
1da177e4 LT |
425 | EXPORT_SYMBOL(ec_write); |
426 | ||
616362de | 427 | int ec_transaction(u8 command, |
9e197219 | 428 | const u8 * wdata, unsigned wdata_len, |
1cb7b1e0 | 429 | u8 * rdata, unsigned rdata_len) |
45bea155 | 430 | { |
8463200a AS |
431 | struct transaction t = {.command = command, |
432 | .wdata = wdata, .rdata = rdata, | |
433 | .wlen = wdata_len, .rlen = rdata_len}; | |
d7a76e4c LP |
434 | if (!first_ec) |
435 | return -ENODEV; | |
45bea155 | 436 | |
2a84cb98 | 437 | return acpi_ec_transaction(first_ec, &t); |
45bea155 | 438 | } |
1da177e4 | 439 | |
ab9e43c6 LP |
440 | EXPORT_SYMBOL(ec_transaction); |
441 | ||
3e2abc5a SF |
442 | /* Get the handle to the EC device */ |
443 | acpi_handle ec_get_handle(void) | |
444 | { | |
445 | if (!first_ec) | |
446 | return NULL; | |
447 | return first_ec->handle; | |
448 | } | |
449 | ||
450 | EXPORT_SYMBOL(ec_get_handle); | |
451 | ||
ad332c8a | 452 | /* |
3eba563e | 453 | * Process _Q events that might have accumulated in the EC. |
ad332c8a KC |
454 | * Run with locked ec mutex. |
455 | */ | |
456 | static void acpi_ec_clear(struct acpi_ec *ec) | |
457 | { | |
458 | int i, status; | |
459 | u8 value = 0; | |
460 | ||
461 | for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { | |
3eba563e | 462 | status = acpi_ec_sync_query(ec, &value); |
ad332c8a KC |
463 | if (status || !value) |
464 | break; | |
465 | } | |
466 | ||
467 | if (unlikely(i == ACPI_EC_CLEAR_MAX)) | |
468 | pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); | |
469 | else | |
470 | pr_info("%d stale EC events cleared\n", i); | |
471 | } | |
472 | ||
fe955682 | 473 | void acpi_ec_block_transactions(void) |
f6bb13aa RW |
474 | { |
475 | struct acpi_ec *ec = first_ec; | |
476 | ||
477 | if (!ec) | |
478 | return; | |
479 | ||
f351d027 | 480 | mutex_lock(&ec->mutex); |
f6bb13aa | 481 | /* Prevent transactions from being carried out */ |
fe955682 | 482 | set_bit(EC_FLAGS_BLOCKED, &ec->flags); |
f351d027 | 483 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
484 | } |
485 | ||
fe955682 | 486 | void acpi_ec_unblock_transactions(void) |
f6bb13aa RW |
487 | { |
488 | struct acpi_ec *ec = first_ec; | |
489 | ||
490 | if (!ec) | |
491 | return; | |
492 | ||
f351d027 | 493 | mutex_lock(&ec->mutex); |
f6bb13aa | 494 | /* Allow transactions to be carried out again */ |
fe955682 | 495 | clear_bit(EC_FLAGS_BLOCKED, &ec->flags); |
ad332c8a KC |
496 | |
497 | if (EC_FLAGS_CLEAR_ON_RESUME) | |
498 | acpi_ec_clear(ec); | |
499 | ||
f351d027 | 500 | mutex_unlock(&ec->mutex); |
f6bb13aa RW |
501 | } |
502 | ||
fe955682 | 503 | void acpi_ec_unblock_transactions_early(void) |
d5a64513 RW |
504 | { |
505 | /* | |
506 | * Allow transactions to happen again (this function is called from | |
507 | * atomic context during wakeup, so we don't need to acquire the mutex). | |
508 | */ | |
509 | if (first_ec) | |
fe955682 | 510 | clear_bit(EC_FLAGS_BLOCKED, &first_ec->flags); |
d5a64513 RW |
511 | } |
512 | ||
a62e8f19 | 513 | static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data) |
3576cf61 DS |
514 | { |
515 | int result; | |
6ccedb10 | 516 | u8 d; |
8463200a AS |
517 | struct transaction t = {.command = ACPI_EC_COMMAND_QUERY, |
518 | .wdata = NULL, .rdata = &d, | |
519 | .wlen = 0, .rlen = 1}; | |
6ccedb10 AS |
520 | if (!ec || !data) |
521 | return -EINVAL; | |
6ccedb10 AS |
522 | /* |
523 | * Query the EC to find out which _Qxx method we need to evaluate. | |
524 | * Note that successful completion of the query causes the ACPI_EC_SCI | |
525 | * bit to be cleared (and thus clearing the interrupt source). | |
526 | */ | |
a62e8f19 | 527 | result = acpi_ec_transaction_unlocked(ec, &t); |
6ccedb10 AS |
528 | if (result) |
529 | return result; | |
6ccedb10 AS |
530 | if (!d) |
531 | return -ENODATA; | |
6ccedb10 AS |
532 | *data = d; |
533 | return 0; | |
1da177e4 LT |
534 | } |
535 | ||
1da177e4 LT |
536 | /* -------------------------------------------------------------------------- |
537 | Event Management | |
538 | -------------------------------------------------------------------------- */ | |
837012ed AS |
539 | int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |
540 | acpi_handle handle, acpi_ec_query_func func, | |
541 | void *data) | |
542 | { | |
543 | struct acpi_ec_query_handler *handler = | |
544 | kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); | |
545 | if (!handler) | |
546 | return -ENOMEM; | |
547 | ||
548 | handler->query_bit = query_bit; | |
549 | handler->handle = handle; | |
550 | handler->func = func; | |
551 | handler->data = data; | |
f351d027 | 552 | mutex_lock(&ec->mutex); |
30c08574 | 553 | list_add(&handler->node, &ec->list); |
f351d027 | 554 | mutex_unlock(&ec->mutex); |
837012ed AS |
555 | return 0; |
556 | } | |
557 | ||
558 | EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); | |
559 | ||
560 | void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) | |
561 | { | |
1544fdbc | 562 | struct acpi_ec_query_handler *handler, *tmp; |
f351d027 | 563 | mutex_lock(&ec->mutex); |
1544fdbc | 564 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
565 | if (query_bit == handler->query_bit) { |
566 | list_del(&handler->node); | |
567 | kfree(handler); | |
837012ed AS |
568 | } |
569 | } | |
f351d027 | 570 | mutex_unlock(&ec->mutex); |
837012ed AS |
571 | } |
572 | ||
573 | EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); | |
1da177e4 | 574 | |
a62e8f19 | 575 | static void acpi_ec_run(void *cxt) |
45bea155 | 576 | { |
a62e8f19 AS |
577 | struct acpi_ec_query_handler *handler = cxt; |
578 | if (!handler) | |
e41334c0 | 579 | return; |
16a26e85 | 580 | pr_debug("start query execution\n"); |
a62e8f19 AS |
581 | if (handler->func) |
582 | handler->func(handler->data); | |
583 | else if (handler->handle) | |
584 | acpi_evaluate_object(handler->handle, NULL, NULL, NULL); | |
16a26e85 | 585 | pr_debug("stop query execution\n"); |
a62e8f19 AS |
586 | kfree(handler); |
587 | } | |
588 | ||
3eba563e | 589 | static int acpi_ec_sync_query(struct acpi_ec *ec, u8 *data) |
a62e8f19 AS |
590 | { |
591 | u8 value = 0; | |
592 | int status; | |
593 | struct acpi_ec_query_handler *handler, *copy; | |
3eba563e KC |
594 | |
595 | status = acpi_ec_query_unlocked(ec, &value); | |
596 | if (data) | |
597 | *data = value; | |
598 | if (status) | |
a62e8f19 | 599 | return status; |
3eba563e | 600 | |
837012ed AS |
601 | list_for_each_entry(handler, &ec->list, node) { |
602 | if (value == handler->query_bit) { | |
603 | /* have custom handler for this bit */ | |
a62e8f19 AS |
604 | copy = kmalloc(sizeof(*handler), GFP_KERNEL); |
605 | if (!copy) | |
606 | return -ENOMEM; | |
607 | memcpy(copy, handler, sizeof(*copy)); | |
16a26e85 LT |
608 | pr_debug("push query execution (0x%2x) on queue\n", |
609 | value); | |
f5347867 AS |
610 | return acpi_os_execute((copy->func) ? |
611 | OSL_NOTIFY_HANDLER : OSL_GPE_HANDLER, | |
a62e8f19 | 612 | acpi_ec_run, copy); |
837012ed AS |
613 | } |
614 | } | |
a62e8f19 AS |
615 | return 0; |
616 | } | |
617 | ||
618 | static void acpi_ec_gpe_query(void *ec_cxt) | |
619 | { | |
620 | struct acpi_ec *ec = ec_cxt; | |
621 | if (!ec) | |
622 | return; | |
f351d027 | 623 | mutex_lock(&ec->mutex); |
3eba563e | 624 | acpi_ec_sync_query(ec, NULL); |
f351d027 | 625 | mutex_unlock(&ec->mutex); |
45bea155 | 626 | } |
1da177e4 | 627 | |
a62e8f19 AS |
628 | static int ec_check_sci(struct acpi_ec *ec, u8 state) |
629 | { | |
630 | if (state & ACPI_EC_FLAG_SCI) { | |
631 | if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { | |
16a26e85 | 632 | pr_debug("push gpe query to the queue\n"); |
a62e8f19 AS |
633 | return acpi_os_execute(OSL_NOTIFY_HANDLER, |
634 | acpi_ec_gpe_query, ec); | |
635 | } | |
636 | } | |
637 | return 0; | |
638 | } | |
639 | ||
8b6cd8ad LM |
640 | static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, |
641 | u32 gpe_number, void *data) | |
1da177e4 | 642 | { |
f92fca00 | 643 | unsigned long flags; |
3d02b90b | 644 | struct acpi_ec *ec = data; |
7c6db4e0 | 645 | |
f92fca00 | 646 | spin_lock_irqsave(&ec->lock, flags); |
c0d65341 | 647 | if (advance_transaction(ec)) |
2a84cb98 | 648 | wake_up(&ec->wait); |
c0d65341 LZ |
649 | spin_unlock_irqrestore(&ec->lock, flags); |
650 | ec_check_sci(ec, acpi_ec_read_status(ec)); | |
bba63a29 | 651 | return ACPI_INTERRUPT_HANDLED | ACPI_REENABLE_GPE; |
845625cd AS |
652 | } |
653 | ||
1da177e4 LT |
654 | /* -------------------------------------------------------------------------- |
655 | Address Space Management | |
656 | -------------------------------------------------------------------------- */ | |
657 | ||
1da177e4 | 658 | static acpi_status |
5b7734b4 | 659 | acpi_ec_space_handler(u32 function, acpi_physical_address address, |
dadf28a1 | 660 | u32 bits, u64 *value64, |
50526df6 | 661 | void *handler_context, void *region_context) |
1da177e4 | 662 | { |
3d02b90b | 663 | struct acpi_ec *ec = handler_context; |
dadf28a1 AS |
664 | int result = 0, i, bytes = bits / 8; |
665 | u8 *value = (u8 *)value64; | |
1da177e4 | 666 | |
1da177e4 | 667 | if ((address > 0xFF) || !value || !handler_context) |
d550d98d | 668 | return AE_BAD_PARAMETER; |
1da177e4 | 669 | |
5b7734b4 | 670 | if (function != ACPI_READ && function != ACPI_WRITE) |
d550d98d | 671 | return AE_BAD_PARAMETER; |
1da177e4 | 672 | |
dadf28a1 | 673 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 674 | acpi_ec_burst_enable(ec); |
b3b233c7 | 675 | |
dadf28a1 AS |
676 | for (i = 0; i < bytes; ++i, ++address, ++value) |
677 | result = (function == ACPI_READ) ? | |
678 | acpi_ec_read(ec, address, value) : | |
679 | acpi_ec_write(ec, address, *value); | |
1da177e4 | 680 | |
dadf28a1 | 681 | if (EC_FLAGS_MSI || bits > 8) |
6a63b06f | 682 | acpi_ec_burst_disable(ec); |
b3b233c7 | 683 | |
1da177e4 LT |
684 | switch (result) { |
685 | case -EINVAL: | |
d550d98d | 686 | return AE_BAD_PARAMETER; |
1da177e4 LT |
687 | break; |
688 | case -ENODEV: | |
d550d98d | 689 | return AE_NOT_FOUND; |
1da177e4 LT |
690 | break; |
691 | case -ETIME: | |
d550d98d | 692 | return AE_TIME; |
1da177e4 LT |
693 | break; |
694 | default: | |
d550d98d | 695 | return AE_OK; |
1da177e4 | 696 | } |
1da177e4 LT |
697 | } |
698 | ||
1da177e4 LT |
699 | /* -------------------------------------------------------------------------- |
700 | Driver Interface | |
701 | -------------------------------------------------------------------------- */ | |
c0900c35 AS |
702 | static acpi_status |
703 | ec_parse_io_ports(struct acpi_resource *resource, void *context); | |
704 | ||
c0900c35 AS |
705 | static struct acpi_ec *make_acpi_ec(void) |
706 | { | |
707 | struct acpi_ec *ec = kzalloc(sizeof(struct acpi_ec), GFP_KERNEL); | |
708 | if (!ec) | |
709 | return NULL; | |
080e412c | 710 | ec->flags = 1 << EC_FLAGS_QUERY_PENDING; |
f351d027 | 711 | mutex_init(&ec->mutex); |
c0900c35 | 712 | init_waitqueue_head(&ec->wait); |
837012ed | 713 | INIT_LIST_HEAD(&ec->list); |
f351d027 | 714 | spin_lock_init(&ec->lock); |
c0900c35 AS |
715 | return ec; |
716 | } | |
837012ed | 717 | |
c019b193 AS |
718 | static acpi_status |
719 | acpi_ec_register_query_methods(acpi_handle handle, u32 level, | |
720 | void *context, void **return_value) | |
721 | { | |
0175d562 LM |
722 | char node_name[5]; |
723 | struct acpi_buffer buffer = { sizeof(node_name), node_name }; | |
c019b193 AS |
724 | struct acpi_ec *ec = context; |
725 | int value = 0; | |
0175d562 LM |
726 | acpi_status status; |
727 | ||
728 | status = acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
729 | ||
730 | if (ACPI_SUCCESS(status) && sscanf(node_name, "_Q%x", &value) == 1) { | |
c019b193 AS |
731 | acpi_ec_add_query_handler(ec, value, handle, NULL, NULL); |
732 | } | |
733 | return AE_OK; | |
734 | } | |
735 | ||
cd8c93a4 AS |
736 | static acpi_status |
737 | ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) | |
837012ed | 738 | { |
cd8c93a4 | 739 | acpi_status status; |
d21cf3c1 | 740 | unsigned long long tmp = 0; |
cd8c93a4 AS |
741 | |
742 | struct acpi_ec *ec = context; | |
a5032bfd AS |
743 | |
744 | /* clear addr values, ec_parse_io_ports depend on it */ | |
745 | ec->command_addr = ec->data_addr = 0; | |
746 | ||
cd8c93a4 AS |
747 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
748 | ec_parse_io_ports, ec); | |
749 | if (ACPI_FAILURE(status)) | |
750 | return status; | |
837012ed AS |
751 | |
752 | /* Get GPE bit assignment (EC events). */ | |
753 | /* TODO: Add support for _GPE returning a package */ | |
27663c58 | 754 | status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); |
cd8c93a4 AS |
755 | if (ACPI_FAILURE(status)) |
756 | return status; | |
27663c58 | 757 | ec->gpe = tmp; |
837012ed | 758 | /* Use the global lock for all EC transactions? */ |
d21cf3c1 | 759 | tmp = 0; |
27663c58 MW |
760 | acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); |
761 | ec->global_lock = tmp; | |
837012ed | 762 | ec->handle = handle; |
cd8c93a4 | 763 | return AE_CTRL_TERMINATE; |
837012ed AS |
764 | } |
765 | ||
5efc5476 BH |
766 | static int ec_install_handlers(struct acpi_ec *ec) |
767 | { | |
768 | acpi_status status; | |
769 | if (test_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags)) | |
770 | return 0; | |
771 | status = acpi_install_gpe_handler(NULL, ec->gpe, | |
772 | ACPI_GPE_EDGE_TRIGGERED, | |
773 | &acpi_ec_gpe_handler, ec); | |
774 | if (ACPI_FAILURE(status)) | |
775 | return -ENODEV; | |
9630bdd9 | 776 | |
a44061aa | 777 | acpi_enable_gpe(NULL, ec->gpe); |
5efc5476 BH |
778 | status = acpi_install_address_space_handler(ec->handle, |
779 | ACPI_ADR_SPACE_EC, | |
780 | &acpi_ec_space_handler, | |
781 | NULL, ec); | |
782 | if (ACPI_FAILURE(status)) { | |
783 | if (status == AE_NOT_FOUND) { | |
784 | /* | |
785 | * Maybe OS fails in evaluating the _REG object. | |
786 | * The AE_NOT_FOUND error will be ignored and OS | |
787 | * continue to initialize EC. | |
788 | */ | |
16a26e85 | 789 | pr_err("Fail in evaluating the _REG object" |
5efc5476 BH |
790 | " of EC device. Broken bios is suspected.\n"); |
791 | } else { | |
42b946bb | 792 | acpi_disable_gpe(NULL, ec->gpe); |
5efc5476 BH |
793 | acpi_remove_gpe_handler(NULL, ec->gpe, |
794 | &acpi_ec_gpe_handler); | |
795 | return -ENODEV; | |
796 | } | |
797 | } | |
798 | ||
799 | set_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); | |
800 | return 0; | |
801 | } | |
802 | ||
4c611060 AS |
803 | static void ec_remove_handlers(struct acpi_ec *ec) |
804 | { | |
a44061aa | 805 | acpi_disable_gpe(NULL, ec->gpe); |
4c611060 AS |
806 | if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, |
807 | ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) | |
16a26e85 | 808 | pr_err("failed to remove space handler\n"); |
4c611060 AS |
809 | if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, |
810 | &acpi_ec_gpe_handler))) | |
16a26e85 | 811 | pr_err("failed to remove gpe handler\n"); |
7c6db4e0 | 812 | clear_bit(EC_FLAGS_HANDLERS_INSTALLED, &ec->flags); |
4c611060 AS |
813 | } |
814 | ||
703959d4 | 815 | static int acpi_ec_add(struct acpi_device *device) |
1da177e4 | 816 | { |
703959d4 | 817 | struct acpi_ec *ec = NULL; |
d02be047 | 818 | int ret; |
45bea155 | 819 | |
c0900c35 AS |
820 | strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); |
821 | strcpy(acpi_device_class(device), ACPI_EC_CLASS); | |
822 | ||
4c611060 | 823 | /* Check for boot EC */ |
ce52ddf5 AS |
824 | if (boot_ec && |
825 | (boot_ec->handle == device->handle || | |
826 | boot_ec->handle == ACPI_ROOT_OBJECT)) { | |
827 | ec = boot_ec; | |
828 | boot_ec = NULL; | |
829 | } else { | |
830 | ec = make_acpi_ec(); | |
831 | if (!ec) | |
832 | return -ENOMEM; | |
a5032bfd AS |
833 | } |
834 | if (ec_parse_device(device->handle, 0, ec, NULL) != | |
835 | AE_CTRL_TERMINATE) { | |
ce52ddf5 AS |
836 | kfree(ec); |
837 | return -EINVAL; | |
4c611060 AS |
838 | } |
839 | ||
ce52ddf5 AS |
840 | /* Find and register all query methods */ |
841 | acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, | |
2263576c | 842 | acpi_ec_register_query_methods, NULL, ec, NULL); |
ce52ddf5 | 843 | |
4c611060 AS |
844 | if (!first_ec) |
845 | first_ec = ec; | |
db89b4f0 | 846 | device->driver_data = ec; |
de4f1046 | 847 | |
d6795fe3 AK |
848 | ret = !!request_region(ec->data_addr, 1, "EC data"); |
849 | WARN(!ret, "Could not request EC data io port 0x%lx", ec->data_addr); | |
850 | ret = !!request_region(ec->command_addr, 1, "EC cmd"); | |
851 | WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); | |
de4f1046 | 852 | |
16a26e85 | 853 | pr_info("GPE = 0x%lx, I/O: command/status = 0x%lx, data = 0x%lx\n", |
4c611060 | 854 | ec->gpe, ec->command_addr, ec->data_addr); |
5efc5476 BH |
855 | |
856 | ret = ec_install_handlers(ec); | |
857 | ||
858 | /* EC is fully operational, allow queries */ | |
859 | clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags); | |
ad332c8a KC |
860 | |
861 | /* Clear stale _Q events if hardware might require that */ | |
862 | if (EC_FLAGS_CLEAR_ON_RESUME) { | |
863 | mutex_lock(&ec->mutex); | |
864 | acpi_ec_clear(ec); | |
865 | mutex_unlock(&ec->mutex); | |
866 | } | |
5efc5476 | 867 | return ret; |
1da177e4 LT |
868 | } |
869 | ||
51fac838 | 870 | static int acpi_ec_remove(struct acpi_device *device) |
1da177e4 | 871 | { |
01f22462 | 872 | struct acpi_ec *ec; |
07ddf768 | 873 | struct acpi_ec_query_handler *handler, *tmp; |
1da177e4 | 874 | |
1da177e4 | 875 | if (!device) |
d550d98d | 876 | return -EINVAL; |
1da177e4 LT |
877 | |
878 | ec = acpi_driver_data(device); | |
cf745ec7 | 879 | ec_remove_handlers(ec); |
f351d027 | 880 | mutex_lock(&ec->mutex); |
07ddf768 | 881 | list_for_each_entry_safe(handler, tmp, &ec->list, node) { |
837012ed AS |
882 | list_del(&handler->node); |
883 | kfree(handler); | |
884 | } | |
f351d027 | 885 | mutex_unlock(&ec->mutex); |
de4f1046 TR |
886 | release_region(ec->data_addr, 1); |
887 | release_region(ec->command_addr, 1); | |
db89b4f0 | 888 | device->driver_data = NULL; |
d033879c | 889 | if (ec == first_ec) |
c0900c35 | 890 | first_ec = NULL; |
4c611060 | 891 | kfree(ec); |
d550d98d | 892 | return 0; |
1da177e4 LT |
893 | } |
894 | ||
1da177e4 | 895 | static acpi_status |
c0900c35 | 896 | ec_parse_io_ports(struct acpi_resource *resource, void *context) |
1da177e4 | 897 | { |
3d02b90b | 898 | struct acpi_ec *ec = context; |
1da177e4 | 899 | |
01f22462 | 900 | if (resource->type != ACPI_RESOURCE_TYPE_IO) |
1da177e4 | 901 | return AE_OK; |
1da177e4 LT |
902 | |
903 | /* | |
904 | * The first address region returned is the data port, and | |
905 | * the second address region returned is the status/command | |
906 | * port. | |
907 | */ | |
de4f1046 | 908 | if (ec->data_addr == 0) |
6ffb221a | 909 | ec->data_addr = resource->data.io.minimum; |
de4f1046 | 910 | else if (ec->command_addr == 0) |
6ffb221a | 911 | ec->command_addr = resource->data.io.minimum; |
01f22462 | 912 | else |
1da177e4 | 913 | return AE_CTRL_TERMINATE; |
1da177e4 | 914 | |
1da177e4 LT |
915 | return AE_OK; |
916 | } | |
917 | ||
c04209a7 AS |
918 | int __init acpi_boot_ec_enable(void) |
919 | { | |
7c6db4e0 | 920 | if (!boot_ec || test_bit(EC_FLAGS_HANDLERS_INSTALLED, &boot_ec->flags)) |
c04209a7 AS |
921 | return 0; |
922 | if (!ec_install_handlers(boot_ec)) { | |
923 | first_ec = boot_ec; | |
924 | return 0; | |
925 | } | |
926 | return -EFAULT; | |
927 | } | |
928 | ||
223883b7 AS |
929 | static const struct acpi_device_id ec_device_ids[] = { |
930 | {"PNP0C09", 0}, | |
931 | {"", 0}, | |
932 | }; | |
933 | ||
478fa03b AS |
934 | /* Some BIOS do not survive early DSDT scan, skip it */ |
935 | static int ec_skip_dsdt_scan(const struct dmi_system_id *id) | |
936 | { | |
937 | EC_FLAGS_SKIP_DSDT_SCAN = 1; | |
938 | return 0; | |
939 | } | |
940 | ||
0adf3c74 AS |
941 | /* ASUStek often supplies us with broken ECDT, validate it */ |
942 | static int ec_validate_ecdt(const struct dmi_system_id *id) | |
943 | { | |
944 | EC_FLAGS_VALIDATE_ECDT = 1; | |
945 | return 0; | |
946 | } | |
947 | ||
948 | /* MSI EC needs special treatment, enable it */ | |
949 | static int ec_flag_msi(const struct dmi_system_id *id) | |
950 | { | |
16a26e85 | 951 | pr_debug("Detected MSI hardware, enabling workarounds.\n"); |
0adf3c74 AS |
952 | EC_FLAGS_MSI = 1; |
953 | EC_FLAGS_VALIDATE_ECDT = 1; | |
954 | return 0; | |
955 | } | |
956 | ||
67bfa9b6 FT |
957 | /* |
958 | * Clevo M720 notebook actually works ok with IRQ mode, if we lifted | |
959 | * the GPE storm threshold back to 20 | |
960 | */ | |
961 | static int ec_enlarge_storm_threshold(const struct dmi_system_id *id) | |
962 | { | |
963 | pr_debug("Setting the EC GPE storm threshold to 20\n"); | |
964 | ec_storm_threshold = 20; | |
965 | return 0; | |
966 | } | |
967 | ||
ad332c8a KC |
968 | /* |
969 | * On some hardware it is necessary to clear events accumulated by the EC during | |
970 | * sleep. These ECs stop reporting GPEs until they are manually polled, if too | |
971 | * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) | |
972 | * | |
973 | * https://bugzilla.kernel.org/show_bug.cgi?id=44161 | |
974 | * | |
975 | * Ideally, the EC should also be instructed NOT to accumulate events during | |
976 | * sleep (which Windows seems to do somehow), but the interface to control this | |
977 | * behaviour is not known at this time. | |
978 | * | |
979 | * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, | |
980 | * however it is very likely that other Samsung models are affected. | |
981 | * | |
982 | * On systems which don't accumulate _Q events during sleep, this extra check | |
983 | * should be harmless. | |
984 | */ | |
985 | static int ec_clear_on_resume(const struct dmi_system_id *id) | |
986 | { | |
987 | pr_debug("Detected system needing EC poll on resume.\n"); | |
988 | EC_FLAGS_CLEAR_ON_RESUME = 1; | |
989 | return 0; | |
990 | } | |
991 | ||
6cef7497 | 992 | static struct dmi_system_id ec_dmi_table[] __initdata = { |
478fa03b AS |
993 | { |
994 | ec_skip_dsdt_scan, "Compal JFL92", { | |
995 | DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"), | |
996 | DMI_MATCH(DMI_BOARD_NAME, "JFL92") }, NULL}, | |
0adf3c74 AS |
997 | { |
998 | ec_flag_msi, "MSI hardware", { | |
55b313f2 AS |
999 | DMI_MATCH(DMI_BIOS_VENDOR, "Micro-Star")}, NULL}, |
1000 | { | |
1001 | ec_flag_msi, "MSI hardware", { | |
1002 | DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star")}, NULL}, | |
1003 | { | |
1004 | ec_flag_msi, "MSI hardware", { | |
1005 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-Star")}, NULL}, | |
0adf3c74 | 1006 | { |
a5dc4f89 AS |
1007 | ec_flag_msi, "MSI hardware", { |
1008 | DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR")}, NULL}, | |
1009 | { | |
534bc4e3 ZR |
1010 | ec_flag_msi, "Quanta hardware", { |
1011 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1012 | DMI_MATCH(DMI_PRODUCT_NAME, "TW8/SW8/DW8"),}, NULL}, | |
1013 | { | |
1014 | ec_flag_msi, "Quanta hardware", { | |
1015 | DMI_MATCH(DMI_SYS_VENDOR, "Quanta"), | |
1016 | DMI_MATCH(DMI_PRODUCT_NAME, "TW9/SW9"),}, NULL}, | |
1017 | { | |
0adf3c74 AS |
1018 | ec_validate_ecdt, "ASUS hardware", { |
1019 | DMI_MATCH(DMI_BIOS_VENDOR, "ASUS") }, NULL}, | |
af986d10 PC |
1020 | { |
1021 | ec_validate_ecdt, "ASUS hardware", { | |
1022 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc.") }, NULL}, | |
67bfa9b6 FT |
1023 | { |
1024 | ec_enlarge_storm_threshold, "CLEVO hardware", { | |
1025 | DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."), | |
1026 | DMI_MATCH(DMI_PRODUCT_NAME, "M720T/M730T"),}, NULL}, | |
eff9a4b6 LT |
1027 | { |
1028 | ec_skip_dsdt_scan, "HP Folio 13", { | |
1029 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
1030 | DMI_MATCH(DMI_PRODUCT_NAME, "HP Folio 13"),}, NULL}, | |
524f42fa LT |
1031 | { |
1032 | ec_validate_ecdt, "ASUS hardware", { | |
1033 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."), | |
1034 | DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL}, | |
ad332c8a KC |
1035 | { |
1036 | ec_clear_on_resume, "Samsung hardware", { | |
1037 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL}, | |
0adf3c74 AS |
1038 | {}, |
1039 | }; | |
1040 | ||
c0900c35 AS |
1041 | int __init acpi_ec_ecdt_probe(void) |
1042 | { | |
c0900c35 | 1043 | acpi_status status; |
c6cb0e87 | 1044 | struct acpi_ec *saved_ec = NULL; |
50526df6 | 1045 | struct acpi_table_ecdt *ecdt_ptr; |
45bea155 | 1046 | |
d66d969d AS |
1047 | boot_ec = make_acpi_ec(); |
1048 | if (!boot_ec) | |
c0900c35 AS |
1049 | return -ENOMEM; |
1050 | /* | |
1051 | * Generate a boot ec context | |
1052 | */ | |
0adf3c74 | 1053 | dmi_check_system(ec_dmi_table); |
15a58ed1 AS |
1054 | status = acpi_get_table(ACPI_SIG_ECDT, 1, |
1055 | (struct acpi_table_header **)&ecdt_ptr); | |
cd8c93a4 | 1056 | if (ACPI_SUCCESS(status)) { |
16a26e85 | 1057 | pr_info("EC description table is found, configuring boot EC\n"); |
cd8c93a4 AS |
1058 | boot_ec->command_addr = ecdt_ptr->control.address; |
1059 | boot_ec->data_addr = ecdt_ptr->data.address; | |
1060 | boot_ec->gpe = ecdt_ptr->gpe; | |
4af8e10a | 1061 | boot_ec->handle = ACPI_ROOT_OBJECT; |
ce52ddf5 | 1062 | acpi_get_handle(ACPI_ROOT_OBJECT, ecdt_ptr->id, &boot_ec->handle); |
c6cb0e87 | 1063 | /* Don't trust ECDT, which comes from ASUSTek */ |
0adf3c74 | 1064 | if (!EC_FLAGS_VALIDATE_ECDT) |
c5279dee | 1065 | goto install; |
d6bd535d | 1066 | saved_ec = kmemdup(boot_ec, sizeof(struct acpi_ec), GFP_KERNEL); |
c6cb0e87 AS |
1067 | if (!saved_ec) |
1068 | return -ENOMEM; | |
c5279dee | 1069 | /* fall through */ |
cd8c93a4 | 1070 | } |
0adf3c74 | 1071 | |
ed4b197d CIK |
1072 | if (EC_FLAGS_SKIP_DSDT_SCAN) { |
1073 | kfree(saved_ec); | |
478fa03b | 1074 | return -ENODEV; |
ed4b197d | 1075 | } |
478fa03b | 1076 | |
c5279dee AS |
1077 | /* This workaround is needed only on some broken machines, |
1078 | * which require early EC, but fail to provide ECDT */ | |
16a26e85 | 1079 | pr_debug("Look up EC in DSDT\n"); |
c5279dee AS |
1080 | status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, |
1081 | boot_ec, NULL); | |
1082 | /* Check that acpi_get_devices actually find something */ | |
1083 | if (ACPI_FAILURE(status) || !boot_ec->handle) | |
1084 | goto error; | |
c6cb0e87 AS |
1085 | if (saved_ec) { |
1086 | /* try to find good ECDT from ASUSTek */ | |
1087 | if (saved_ec->command_addr != boot_ec->command_addr || | |
1088 | saved_ec->data_addr != boot_ec->data_addr || | |
1089 | saved_ec->gpe != boot_ec->gpe || | |
1090 | saved_ec->handle != boot_ec->handle) | |
16a26e85 | 1091 | pr_info("ASUSTek keeps feeding us with broken " |
c6cb0e87 AS |
1092 | "ECDT tables, which are very hard to workaround. " |
1093 | "Trying to use DSDT EC info instead. Please send " | |
1094 | "output of acpidump to linux-acpi@vger.kernel.org\n"); | |
1095 | kfree(saved_ec); | |
1096 | saved_ec = NULL; | |
1097 | } else { | |
1098 | /* We really need to limit this workaround, the only ASUS, | |
1099 | * which needs it, has fake EC._INI method, so use it as flag. | |
1100 | * Keep boot_ec struct as it will be needed soon. | |
1101 | */ | |
c6cb0e87 | 1102 | if (!dmi_name_in_vendors("ASUS") || |
952c63e9 | 1103 | !acpi_has_method(boot_ec->handle, "_INI")) |
c6cb0e87 AS |
1104 | return -ENODEV; |
1105 | } | |
c5279dee AS |
1106 | install: |
1107 | if (!ec_install_handlers(boot_ec)) { | |
d033879c | 1108 | first_ec = boot_ec; |
e8284321 | 1109 | return 0; |
d033879c | 1110 | } |
c5279dee | 1111 | error: |
d66d969d | 1112 | kfree(boot_ec); |
ed4b197d | 1113 | kfree(saved_ec); |
d66d969d | 1114 | boot_ec = NULL; |
1da177e4 LT |
1115 | return -ENODEV; |
1116 | } | |
1117 | ||
223883b7 AS |
1118 | static struct acpi_driver acpi_ec_driver = { |
1119 | .name = "ec", | |
1120 | .class = ACPI_EC_CLASS, | |
1121 | .ids = ec_device_ids, | |
1122 | .ops = { | |
1123 | .add = acpi_ec_add, | |
1124 | .remove = acpi_ec_remove, | |
223883b7 AS |
1125 | }, |
1126 | }; | |
1127 | ||
a5f820fe | 1128 | int __init acpi_ec_init(void) |
1da177e4 | 1129 | { |
50526df6 | 1130 | int result = 0; |
1da177e4 | 1131 | |
1da177e4 LT |
1132 | /* Now register the driver for the EC */ |
1133 | result = acpi_bus_register_driver(&acpi_ec_driver); | |
49c6c5ff | 1134 | if (result < 0) |
d550d98d | 1135 | return -ENODEV; |
1da177e4 | 1136 | |
d550d98d | 1137 | return result; |
1da177e4 LT |
1138 | } |
1139 | ||
1da177e4 LT |
1140 | /* EC driver currently not unloadable */ |
1141 | #if 0 | |
50526df6 | 1142 | static void __exit acpi_ec_exit(void) |
1da177e4 | 1143 | { |
1da177e4 LT |
1144 | |
1145 | acpi_bus_unregister_driver(&acpi_ec_driver); | |
d550d98d | 1146 | return; |
1da177e4 | 1147 | } |
7843932a | 1148 | #endif /* 0 */ |